The city's Vision Zero SF initiative is trying to eliminate all pedestrian traffic deaths by 2024. Its analysis focused on the intersections within the “High Injury Network” where the bulk of San Francisco's traffic-related injuries occur. The city looked at data from 2008 to 2012, weighting severe and fatal injuries more heavily.
The city determined its most dangerous intersections by giving more weight to accidents that involve pedestrians and cyclists. The analysis, conducted by the LA Department of Transportation, used data for collisions between 2009 and 2013.
The three most dangerous intersections in Boston are all along Massachusetts Avenue, a major north-south thoroughfare. The city picked these by looking at ambulance and police data from 2012 to 2014.